Fabrication of Ultrathin MoS ₂ Layers via Interfacial Assembly for Solar Cell Applications

Abstract Achieving high‐quality molybdenum disulfide (MoS 2 ) thin films through scalable and uniform solution‐based deposition techniques remains a critical challenge for optoelectronic and nanoelectronic applications. This study presents a simplified yet highly effective modified interfacial assembly method utilizing a hexane‐water interface, which enables the deposition of a tightly packed, uniform MoS 2 thin film. Scanning electron microscopy analysis reveal substantial improvement in surface coverage (≈90%), underscoring the enhanced efficiency of the process. Optical characterization of the exfoliated MoS 2 flakes reveal an indirect bandgap of 1.63 eV, confirming the presence of multilayer MoS 2 , which is optimal for charge transport layer applications. Electrical measurements demonstrate a direct current conductivity of 0.898 × 10 −6 S cm −1 , suitable for device integration. Importantly, an organic solar cell incorporating the ultrathin MoS 2 film as an electron transport layer is demonstrated.